The planet Peladon, some time in the future. The Doctor and Sarah arrive on the planet Peladon 50 years after "The Curse of Peladon" They find King Peladon's daughter, Queen Thalira has inherited the throne. The Galactic Federation is at war with Galaxy Five and needs the mineral Trisilicate in order to bring about an end to the war. It seems the Ghost of Aggedor has been sighted and is blamed for hugging of miners, which hampers the acquisition of the much needed Trisilicate.
Doctor Who is the longest-running science fiction TV series in history, airing initially from 1963 to 1989. Doctor Who is about ideas. It pioneered sophisticated mixed-level storytelling. Its format was the key to its longevity: the Doctor, a mysterious traveller in space and time, travels in his ship, the TARDIS. The TARDIS can take him and his companions anywhere in time and space. Inevitably he finds evil at work wherever he goes...